2wd to 4wd conversion questions

[Lated]

I am considering converting my '70 C10 to 4wd and have a few questions. Basically, the idea that has been wheelin' around in my head is to build a lowered (not sure how much) full-time 4wd truck. I plan on putting a np203 behind a 700r4.

1. Does a full time 4wd np203 require special hubs or just the same automatic hubs that could be used with a part time transfer case?

2a. What type of front axle should I be looking for? I would prefer IFS but a straight axle would be alright.

2b. If IFS is a possibility, what year truck should I look for to pull the front out of?

3. I've never seen a chevy IFS setup so I'm not really sure how it works. Is the diff. solidly mounted (no vertical movement) with the axle shafts pivoting on either side or does the diff. have some vertical movement to it as well? (Not sure that was worded well, but hopefully it gets the idea across)

Obviously there would be quite a lot of fabrication involved in this project. I'd probably end up needing to move the engine back to allow for vertical movement of the axle if going with a straight axle. Still in the extreme early stages of planning so please don't beat me up too much for stupid questions. I'm sure there will be more questions to come.